Associations marked interface provides callbacks from the session to the application allowing the application to inspect and / or manipulate properties of a persistent object before it is saved, updated, deleted or loaded.

One possible use for this is to track auditing information.

Mate = mate; // later, in a new session second Session.For example, the following using System; using NHibernate. Test { [Serializable] public class Audit Interceptor : IInterceptor { private int updates; private int creates; public void On Delete(object entity, object id, object[] state, string[] property Names, IType[] types) public boolean On Flush Dirty(object entity, object id, object[] current State, object[] previous State, string[] property Names, IType[] types) public boolean On Load(object entity, object id, object[] state, string[] property Names, IType[] types) public boolean On Save(object entity, object id, object[] state, string[] property Names, IType[] types) { if ( entity is IAuditable ) { creates ; for ( int i=0; i NHibernate requires a very rich meta-level model of all entity and value types.From time to time, this model is very useful to the application itself.Mate = potential Mate; // later, in a new session second Session. Update(mate); // update mate if it wants their state also updated.(Except for lifecycle objects, discussed later.) NHibernate users have requested a general purpose method that either saves a transient instance by generating a new identifier or update the persistent state associated with its current identifier. NHibernate distinguishes "new" (unsaved) instances from "existing" (saved or loaded in a previous session) instances by the value of their identifier (or version, or timestamp) property.

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